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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c90da6d3aee3760491cc15977418ba9ae3dda91764d04baba42f61e6d61994c' 
  AND token = 's0hhGo2rF+EjuUhlUkoxJquNqKOpmGYw8ed/i/bK8a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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