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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f34efd3fe883942be7f4138ccdd5c109360be042e86830af97f0e9a54c502d1' 
  AND token = 'IdMkkr6VyWXKMu1rMEvhdB/Wfim4J1rg8p6p3aPcKAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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