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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4212e8933d8c3fde437c24b0c6619d907868c1f5d1cf85d6f1f10e08d4a6f2' 
  AND token = 'C1F/YEN4axbAB9FazQOa1MZ/Kx2EXSua1P37iE7zxhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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