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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212c25ff6f4d5878b35d95978ce1b2c6aee6edc0f7d029829d3a545da72d3df5' 
  AND token = 'zfimuIP/fRr2h8w+rlpFqhcc0gHE/9LyC+OOJ2AzJ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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