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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069959a32a7456c7632ad091d7fbaac1730430da85719e67d1f5a6b98e468b74' 
  AND token = 'D0iHVy6VbZ/gXdYLu1rnc40Q7JIBE+RR49aaNT1Ciik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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