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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920f6f80b486978cb703398351bab6ea112a2f463fe6757195cd010ac1e53330' 
  AND token = 'XnKRXAKH1w3o/2RR5bb0xqDq63O3ddn4Q+PU7443xZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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