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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dc5fe8afdc5d6eb0de37713a603440c100944e42a3baf9466c51ee53bf12a8' 
  AND token = '7vzhWTNhYOGy9oH2uYGc91wK8QsdMuZ/t69usYFmHo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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