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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa743d4815fb25a94e305c94dc9c770e59536f6aa09605d1391489429b5389d' 
  AND token = 'cRoCTTuHSXeC5HagPXkAL6nDc2fHA4uTzRMqXe3EtKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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