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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d5efbe66045974eba1fac085c852d189e2ba81922d3ce1d8ec6d7916a86ed7' 
  AND token = 'mO2hfuUud7HmT9A42y/91O7s0tQB98bgnPb9npkSOzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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