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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519c476e503d8298de3b890ad6fa0e5430b873378ba694452e7dc90f7718355a' 
  AND token = 'P4TOPnS9NOBzBRMNiLlCQG/VML4L7hbI0gn35Nsf/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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