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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedafbb995f792e42fb4eccc16cd338300b017397dd0e827673d69d580078e5e' 
  AND token = 'iL33cmvutuga+xGumNsrSwxEKyGG9B6KdL6B3NnIstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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