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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5602558bb0393cef60cc910e2be80a970661165e7e94fc45d5328c3c11da035d' 
  AND token = 'hayk5FwT/Odlu95aguspi+gTwi00Uz3xujPOkEVOJFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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