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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a71c8008ee4d9a2fd8d90d6b910313d547868fc7b8ae7cc78e023fe0fe82f6' 
  AND token = 'aScWyCVZUqiPgcLX94EwHKeIrbixGp8gL8Em0wm1XTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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