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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4e9b47d236c2922c055322225582167dda87923975ad9b22254310b9ece366' 
  AND token = 'WGuhscicoaQ+hIi4OLWsLYHA7GQ+1S40j47rwP6n2H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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