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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bd8d0aa487255d767df8e24bf371507df117ad8eb8b76d8b15db3455ef249b' 
  AND token = 'aqMGzF8hUJm5jkeBmuCNo3z28RReQgPiB0DyYtvzH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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