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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a935036365aed6d79f1f256736868eb4da8e67a3cb2892fe78ce5624fe3b9a' 
  AND token = 'b/OvTt7Gmd8Rev3/Z5v6tNwwQtcwqtBq9PcgY9GarGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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