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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f1705bbba19ed5ef9a357442427c3442ae8efb443ae39e272489fadcde8540' 
  AND token = 'xK5KSJVtrjZb8oYv6a0z0jsKYp8xlK7AkRay0VuD++Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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