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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bf2170c6dd95efd9d0e5ac88870ee3d0be89e0348193b13c6bb664ac6bb784' 
  AND token = 'ABRHdYEhlj134DjdeU/1fCbbNxk6i6PT8qsPUDEPMwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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