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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a24ed09b5803e88f5e74d0f3ad841fe9140f25e4885cc99265eea59434be54' 
  AND token = '3hCkU7IbMR9vYNyaqexktCPc7vjs9PpPv3zn88r3GBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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