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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227d629f53865273aa6db35d4f8e8ba04e950bbe8dfb3a97171484aab711e26d' 
  AND token = '5NHw6ZAE8tvWfalxyGuguVBrddSQb2k0aFNmDxyTmCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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