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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffe2992138646c2bf4ac433f3009845ce1244ea1177b65ef5b3cce6d691afdc' 
  AND token = 'alFkBj5+w9gqsdfneWWViMknU8sW7dwVTeqzaxwluw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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