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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98c87f0e4e6f3ecf951620fa9bfe9d470ce025d750d4681cd1b67722b5309e1' 
  AND token = 'Eds8dTH0Ib1+jViaJAByceUhQAtBrLx/tuo34amriRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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