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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538e93d9c84c101366472a8e690a4fa82ca41f85c2118b7e8ef93412ee19f39e' 
  AND token = 'df7XoWmoLCBvaYw+K+vuF8cm/rwKCPTB1KbksFej87k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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