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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f01bdd29f288d4d1e3f96a938c15b4bc1586b687577df5d038546f394354dc5' 
  AND token = 'VIqc3v3QVFjQoo0BcVdI3hRKIJRpstRIefA4h6pOaEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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