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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3639a6df2a685a90d7d5de3297faacbdda5a8e7f19fabcc7c18b70cc0e380fbb' 
  AND token = 'loMVnoPxeoffOBhjX6Z7hdKyvseqLU6vUEVJGWMpQ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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