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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff2ea04fce1b97cdc88294f483f926d7ebdfe6cb1d2cc91e854af28dc2a8d4e' 
  AND token = '9RA8/0fRYNcRnTBkYNT9KhcDk093CylEe9bZMfZOLPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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