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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c444b9d320f64699bac9f3fdf8f4cca31a3cde874382156d884aa8681648fd' 
  AND token = 'CbnxyReOjlpGbQYdSht4Sgp3rwIzC2vDg1iOPpE4NEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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