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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996c7c55d006c2fc247702d413a2c68b2817e0b17da31f1aea1164068a4f947d' 
  AND token = 'g2Ze4o2WgnnTvtLhxqEmSpOkRu4UDDGvvpA57+R563I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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