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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba3e481d05fdebba829174d4efeb948154096d39b92a9ef6bee22d60d645ac2' 
  AND token = 'WXY2u1tzCfAKEE+dke84qIkD6lcQP3X2nEPOkC9e0Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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