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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad8c2972abceb95e76a240d54934a99069b2f5a5173625b069a56ea7f51fe75' 
  AND token = '+82UiHZduXjMXyS4o0rD6YkwxOZg81z+XdU3GlqXY6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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