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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c4e2996858f1a9215735fd92dc778d4302972b8db0147cda2a660c6a6777e5' 
  AND token = 'X8U0lXmHO8TaLfkGjuzTuyNEgP08zpHfxumGX4uzKrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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