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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19106490e31edfa64b91beb44559fc19f5ffb9d5b3b5f59bc5f829aa92b9de18' 
  AND token = 'MCcKLgyp/Ebe9DbpG1LAnr/SoARla8lhOzpUA4I2sP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}