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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2f8815c4d72cc7202993eef3f473f854d53a7845239655f8c2ecf31807aba6' 
  AND token = 'M02D2Pn1ICp0rJT3extUd6HcYTlIbE6X0iUAvketFvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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