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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059e4877633e74d705d1937f96f85cfa3ceb81428ba39e792c6c9b8f8ea231a7' 
  AND token = '/bo5HISBuak2UClA7kDKEgpG2abacZZC9YyH+HtzGDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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