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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8ef6bb664ef3a0cc63783cccb4a92a5f75a22acee863cb5b62ae3b3449a616' 
  AND token = '1f03Gal4b+bK0kzEgfJdG4Q4BgEFwcowuqUIsD0zMTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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