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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0566698f9a37991cc61742c0f3b4ae524ad9dc5af9b9d8446b1e5913fbddde' 
  AND token = '3Vevr0yOL3oKCEG6o2KQW69lrOyaBVvbyKTFm9aDiA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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