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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddf7d2273544fc8aac6ca2ce577279ade8e57dfe89796970a11ca57e92da7b2' 
  AND token = 'esj9jJWOSIP0DhZxwzLDP8q8EvbxUd9sX1YYIPAe7II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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