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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbf8d6173e07eb9a215fd8f478780f9f82941fd8ba34733026671f4175f92f9' 
  AND token = 'gkwCgkKCtW6y4dOIU0LDhDEly4dodFtZ775KCG+45Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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