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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659182f3d643bd2204b85011bee673156b3d792fabc95b973144a5630b611546' 
  AND token = '0y10zQBEa1LetL7vfcR44aW7EjxsIqBsaBPfiPh54jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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