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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d70480d62b8911428b7ef8f3a63030a0fd696bc0af5363debf5f9c2a0998fe' 
  AND token = 'hwC3mkTZrYNL1kLsp8AQrpW2uSv8A4vR1rDh414kOX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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