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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5e21c63d6b38bc7f6521730aca34df9f033db65c1d7a9f7fbcaad6b46d0d5f' 
  AND token = 'HRWy6deIjDJHlQNiFVor/FQu1pjR+dX0o86DJXSYKtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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