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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c2b5b5b81b8afa61e11e102598a3df8ba0b8b90f9c2bdd1130bf4d25e58e64' 
  AND token = 'avEhyx3T39Yr/s62qJbIXg1ktLiPgKBV0Sva2wiJ1jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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