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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add1632cbc7f7a691607fadd9aa557d287c46de182a8b6f6575662410ffa202c' 
  AND token = '7dSMvJrTAeqMUgosiqhIJCXjyKYsNp56zL71PhIopTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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