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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25a1fcbd92daad412c4b8d07fcf6639b7dcb1359f2cc2aea558b98f62bf546b' 
  AND token = 'kRvLKuPpcJk7/J6kxsMi+N01s5EuQnerVOrmBiuY/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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