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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5579db5a2545d7331cf4b3831238830ee1ba970529ce0772eb51e41ae204f888' 
  AND token = 'Ya9BRIrqsZ7bThH0sTVyTld3veb7trfB2mUy2TdKcLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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