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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6077fef68eb2dd510ecb0a59b75845ed9928ded9d0bdd34a96aeda7960a80b84' 
  AND token = 'oyQ8G9yCMiw3/z0FSaQ96BgATs2lABg5Urbn96eq5p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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