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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6721a5fbdf4c052fb6a05043e3d2c8f1a95eb42e4a15fa61db00f8627e4e7763' 
  AND token = 'XlXcMMK4ZoYjx1VEIQOBUIBVVg5mXIRl9xWisosx7Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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