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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9695485873ef44e4354e0ec5de6b1a0026647d8e7bd14aa48a434094f970b138' 
  AND token = 'l9vwITql1UvT91Vr1pDAOLgyGDcMfQACnwKpxWCuFB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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