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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f6989846b65db9c551fc690606e4011f98d6531fd74eb628e25e7fe2be4072' 
  AND token = 'HD7S6aTQbx1jXxpJ29P9arLFrVAaL5NRobU2s6k4a+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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