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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef0be3a5a4099c62f363110ece2f0b5b2dad2f662aa7469b498cff5c0aa262c' 
  AND token = 'lWS7Hg6ubmbh7TMAPv6u4nhoRJo/+lIWYTy8F/lnfE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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