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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7fcd1e67be28069ff07acd34bde15e5803f16f2f91e7b30ecdfb5caa62e72f' 
  AND token = 'THYC80K0po6c55RHEF6EzYhdYHmQDo1hJbTeU8Kt5xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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