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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9a8b969820e45abdf98e97edd7d695e404e1d8aa6c1c6692393c799bad0c8f' 
  AND token = 'Bnb3bvAl8KgaNOmykK40Q//HvnP/eZ0/zfWo8aIFJcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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