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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e24e719d35e9d0d783e29352f0f825bf1f34dce37314e90f5ed1e59eda9ec4b' 
  AND token = 'hAvkt6pLjtlS7hcD2CuFY4Nmxsv3OMd9YBIMsFNsYYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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