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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddff8033a7253a2adc7ecf6d1be5af136f64cfb8f6ec0c4bcd419a3230700f3d' 
  AND token = 'zpw/Df5P3t22gH60Xz0fsb/Bic+YMM4sR6NbUszA2tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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