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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92734b30b4641ab433c1b600bbe7a3f3c9301ab46825d84a2430be69dc75457' 
  AND token = '+MSEMDZBcElX4aa+OWvcqx/g1apQDRYxmioqKR8zMdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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