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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11376fc0ea5c0552483da7e0e56f79bff31e54c1716c86ec3b94d582414c4667' 
  AND token = 'O6X4XXOWflIGrUpJv7QARKgm8D58RgEwz8D4OfVUQBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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