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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7679a045d6599a3835dad4358d7cb5ef709aeaa2261a7f3ac479f0f86035c8' 
  AND token = 'eUdRLc6NK1juncaQm8TDYo4jA8EYBZIeZq5p00V0k+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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