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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e026919948786337eefa43e7c2d1eb95f9cf0006c775e4341522b3132f3803' 
  AND token = 'UrABc9AGqCgM59eozU4qY/U45kqHiXP1CWuU8TYULTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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